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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2021, Lukas Reschke <lukas@statuscode.ch>
*
* @author Lukas Reschke <lukas@statuscode.ch>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC\Http\Client;
use Psr\Http\Message\RequestInterface;
class DnsPinMiddleware {
/** @var NegativeDnsCache */
private $negativeDnsCache;
/** @var LocalAddressChecker */
private $localAddressChecker;
public function __construct(
NegativeDnsCache $negativeDnsCache,
LocalAddressChecker $localAddressChecker
) {
$this->negativeDnsCache = $negativeDnsCache;
$this->localAddressChecker = $localAddressChecker;
}
private function dnsResolve(string $target, int $recursionCount) : array {
if ($recursionCount >= 10) {
return [];
}
$recursionCount = $recursionCount++;
$targetIps = [];
$soaDnsEntry = dns_get_record($target, DNS_SOA);
if (isset($soaDnsEntry[0]) && isset($soaDnsEntry[0]['minimum-ttl'])) {
$dnsNegativeTtl = $soaDnsEntry[0]['minimum-ttl'];
} else {
$dnsNegativeTtl = null;
}
$dnsTypes = [DNS_A, DNS_AAAA, DNS_CNAME];
foreach ($dnsTypes as $key => $dnsType) {
if ($this->negativeDnsCache->isNegativeCached($target, $dnsType)) {
unset($dnsTypes[$key]);
continue;
}
$dnsResponses = dns_get_record($target, $dnsType);
$canHaveCnameRecord = true;
if (count($dnsResponses) > 0) {
foreach ($dnsResponses as $key => $dnsResponse) {
if (isset($dnsResponse['ip'])) {
$targetIps[] = $dnsResponse['ip'];
$canHaveCnameRecord = false;
} elseif (isset($dnsResponse['ipv6'])) {
$targetIps[] = $dnsResponse['ipv6'];
$canHaveCnameRecord = false;
} elseif (isset($dnsResponse['target']) && $canHaveCnameRecord) {
$targetIps = array_merge($targetIps, $this->dnsResolve($dnsResponse['target'], $recursionCount));
$canHaveCnameRecord = true;
}
}
} else {
if ($dnsNegativeTtl !== null) {
$this->negativeDnsCache->setNegativeCacheForDnsType($target, $dnsType, $dnsNegativeTtl);
}
}
}
return $targetIps;
}
public function addDnsPinning() {
return function (callable $handler) {
return function (
RequestInterface $request,
array $options
) use ($handler) {
if ($options['nextcloud']['allow_local_address'] === true) {
return $handler($request, $options);
}
$hostName = (string)$request->getUri()->getHost();
$port = $request->getUri()->getPort();
$ports = [
'80',
'443',
];
if ($port !== null) {
$ports[] = (string)$port;
}
$targetIps = $this->dnsResolve($hostName, 0);
foreach ($targetIps as $ip) {
$this->localAddressChecker->ThrowIfLocalIp($ip);
foreach ($ports as $port) {
$curlEntry = $hostName . ':' . $port . ':' . $ip;
$options['curl'][CURLOPT_RESOLVE][] = $curlEntry;
}
}
return $handler($request, $options);
};
};
}
}
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